<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.11.3.min.js"></script>
</head>
<body>
	<button id="btn1">$.ajax</button>
</body>
<script type="text/javascript">
	$("#btn1").click(function(){
		$.ajax({
			url:"${pageContext.request.contextPath}/demo1",
			type:"get",
			data:"username=王五",
			success:function(obj){
				alert(obj);
			},
			error:function(e){
				alert(e);
			}
		});
	})
</script>
</html>